code: def update(self, strategy):
      self._mac.update(strategy.model, strategy.mb_x[0].unsqueeze(0))
  
imports: from torch.nn import Module
  from typing import List, Optional
  from torch import Tensor
  from avalanche.evaluation import Metric, PluginMetric, GenericPluginMetric
label_desc: Use image node_id 2 for calling the MACPluginMetric obj's underlying member method code with example usage: obj.update(strategy) without return types